Lathe



Sept. 21 1926. 1,600,650 E. s. BIRD Er AL- v 'LATHE Filed August s1 192;11 ysheets-sheen'. 4

/ AWA Sept. 21 1926.

E. S. BIRD ET AI.

LATI-l5 Filed August 31 1923 11 Sheets-Smet 5 W ....IIII

1l Sheets-Sh'eet 6 E. s'. BIRD r-:r AL

LATHB Filed August 31 IIE? lllHE Slept. 21 1926.

Sept. 21, 1926.

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LATHE Filed August 151 Sept. 2l 1025@ 1,600,650

E. s. BIRD Er- AL.

LATHE Filed August :31 1923 11 sheets-sheet 9' Sept. 21 1926. 1,600,650

E. s. BIRD x-:r AL

LATHE Filed August 3.1

1923 11 Sheets-Sheva?. l1

. A HI v .Phi 111111||L1V Cir ing the subject matter of a co-pendino'Patented Sept. 21, lgt.

Unire stares earns eric.

EBU/'ARD S. BIRD AND FRANCIS jB. COCK URN, `XNGIILUQ'AJB, GHIO,ASSIGNORS TO THE LODGE 85 SHIPLEY MACHINE TQQL COMANY, OF CINCINNATI,OHIO, ACOR- PORATION 0F OHIO.

LATHE.

` Application filed August 31, 1923.k Serial No. SGl?.

This .invention relates to a metal cutting tool of the lathe typewherein themovements of the carriage and tool slide are automaticallyselectively controlled, wherein thework may be operated upon fromrelatively opposite sides, and wherein each tool or gangof 'tools may beoperated independently and the operation timed so that either mayprecede the other.

MechanismV isl provided for controlling yfeed screws, connected withimproved carriage and tool slide units, said units form- 'GLP' plicationfiled February 26th, 1928, erial No. 621,215. Only'such reference to theconstruction and operation of the unit will be herein made as isVnecessary to a complete understanding of the automatic control thereof.

An object of the invention is the provision of an automatic machinehaving means for operating upon the work from relatively opposite sides,the means at each side being controlled by a separate feed screwoperable eithei1 simultaneously or intermittently with yits companionfeedV screw at ,the opposite side'of the machine. Y y

Another object of the invention is the provision of a machineautomatically and selectively op-erable for machining,` different kindsof work without the use of special attach-v ments for each kind, a.change in machine setting being made by manipulatingstops upon a shaftadapted for controlling',

ythrough special mechanism, the movements of the feed screws, thestopsengageable by an element of the carriage and tool slide unit fortranslating or op-eratingvth-e shaft. The movements of the feed screwsat opposite sid-es of the machine may be automatically selectivelyycontrolled for rapid and slow rotative slpced.

Anot ier object ofthe invention is the provision of means forautomatically selectively and simultaneously, operating a. plurality oftool carrier operating` feed screws, each feed scr-ew operating its toolcarrier for various working cycles, during which the tool may be fedtoward, into .and longitudinally vof the work to a definite degree, andthe depth and length ofv cut being` positively automatically controlled,thetool being subsequently withdrawn from'the work and the carrier reeturned to the Startinspostmei rlhe invention herein provides for the au`tomatic timed rotation of both feed screws in rapid, forward and reversetraverse and forward feed directions, and further provides inconjunction with the carriage and tool slide units, means whereby forawork` lng cycle the tool may be rapidly traversed toward the work, andslowly into or along; the work. At a predetermined point of tool feed,mechanism comes into action,'whicb cuts out the driving mechanism, withtl tool feed continuing under auxiliary nonpositive driving mechanism,until the feed of the tool is positively arrested. At this period thetool can be maintained stationaru for a definite interval which may begoverned by the number of work revolutions before return traverse of thetool commences, the return traverse bringing` the toolto its starting`position. For another cycle the carriage can be traversed toy bring thetool to a setting position, the tool traversed rapidly towards th-e workthen fed slowly into the same, and the tool thereafter rapidly withdrawnto fully retracted position and rew turned to the starting point.

The above operations in cycles may each be automatically performed afterinitial starting by a hand lever. Common power and traverse transmissiontrains connected with the mechanism of the feed boxes provide for theoperation of the feed screws sinniltaneously or (independently. Eachscrew maybe stopped, started, reversed and mane torotate at varyingspeeds in forward and reverse directions independently of the other,making possible the timing of tool movement at relatively opposite sidesof a piece of work in such manner thatfone tool may approach the work atone rate of speed, make a out, and pause while the opposite toolperforms asimilar or different operation upon the piece, the operationsbeine- `automatic from the time they are initiated until the end of thecycle. y

Otherk objects and certain advantages will be more" fully disclosed inthe accompanying drawings forming a part ofthis specication, in whichdrawings:

Figure 1 is a top plany of anautomatic `lathe constructed in accordancewith. the principles of this invention; f

Figure 2 is a side elevation. ,y ,l

Figure 3 is an' end view at the head-stock,

end of the lathe, parts being broken awajv to show the gearingconnections respectively between the pulley power shaft, spindle andcontrol boxes, and between the pulley power shaft, rapid traversegearing, and control boxes.

Figure 4 is a diagrammatic, or developed view illustrating the power andrapid trav erse gear trains relative to spindle, and to the feed screwdrive shaft, in the front control box.

Figure 5 is a vertical longitudinal section through the front controlbox.

Figure 6 is a diagrammatic or a developed view of the mechanism of thecontrol box shown in Fig. 5.

Figure 'T is a transverse section on line 7 77, of Fig. 5.

Figure 8 is a transverse section on line 8 8, of Fig. 5.

Figure 9 is a transverse section on line 99, of Fig. 5, looking in thedirection-of the arrow.

Figure l() is an end elevation of the front control box, taken from thecontrol lever end, and showing the transmission or trip lever shaft insection.

Figure V11 is a detail section on line ll-llt of Fig. 2, showing themounting of the feed cut-out lever.

Figure l2 is a view showingthe relation of the pause index shaft to thepause catch, pause adjusting sleeve and pause trip cam.

Figure 13 is a cross section of the carriages and bed on line 18 l3. ofFig. 2.

Figure 14 is a longitudinal section through the front carriage.

Figure l5 is a sectional side. elevation illustrating the safetycoupling connection between the feed worm shaft and feed screw shaft.

Figure 16 is an end elevation of the bracket supporting the outer endsof the fee l screw and stop screw shafts.

lFigures 17. 18, 19 and 2() are diagrams illustrating the setting of themachine for a turning cycle. e

Figure 2l is side elevation of the starter shifter fork.

Figure 22 shows end elevation and front elevation of the traverse clutchfork.

Figure 23 shows a front and side elevation of the feed clutch fork.

Figure 24 is a. longitudinal section illr trating the manner of couplingthe traverse clutch and feed clutch forks.

F ignre 25 shows an elevation View of the pause trip cam.

Figure y2 6 shows an elevation and end view of the pause adjustingsleeve.

Figure 27 shows an elevation and end view and end V of the pause catch.

Figure 28 shows an elevation of the pause index collar and a sectionalelevation of pause index collar and pause index shaft.

Figure 29 shows the assembly of the traverse trip cam and relatedelements upon the traverse worm wheel shaft.

Figure 30 is a face view of the traverse trip cam.

Figure 8l. is a face view from the tooth side of the traverse adjustingclutch member.

Figure is a sectional view of the forward and reverse traverse clutch.

Figure 33 is a sectional view of the forward traverse miter gear.

Figure Se is a sectional View of the feed clutch.

Figure 35 clutch ring.

Figure 8G is a sectional elevation of the sleeved feed worm gear.

Figure 3T is a sectional elevation of the worin and spur gear sleeve.

Figure 38 is a sectional elevation of the sleeve adapted to be pinned tothe safety coupling shaft.

Figure 39 is a side view of the friction ring.

.Figure t0 is a face view of the same.

".gure al is a sectional elevation of the traverse trip coupling.

Figure 42 is a sectional elevation of the feed trip block.

Figure 43 shows side and end views of the pause trip block.

Figurey 44 shows side and end views of the traverse trip yoke.

Figure 4:5 is an end view of the traverse trip shaft bearing sleeve.

Figure t6 in a detail section of the carriage and tool slide frictiondevice on line 164m, of Fig. 2.

Figures 47, 48 and 49, are diagrammatic views showing the steps insetting the machine for a facing cycle.

Figure 50 is a sectional elevation of modified forms of stops, for thetransmission controlling shaft.

Figure 5l is a fragmentary elevation showing a modified form of pausecam member, and parts operable thereby.

Figure 52 is a fragmentary face view of the front side of the box,showing the incunting of the pause cam lever.

Figure 53 is a vertical sectional view on line 53--53 of Figure 52.

Figure. is a sectional elevation of the pause cam member.

Figure 55 is section on line 55-55 of Figure 54.

Figure 56 is a developed view of the cam projection.

Figure 57 is a longitudinal section illustrating a modified form ofsafety coupling connection or safety clutchY device, as a part of thefeed train, for preventing breakkof the tool.

Figure 58 is a transverse section on line 58-58 of Figure 57, s l'iowingthe structure is a sectional view of the feed of the safety clutch, andarrangement thereof on the feed worm shaft.

Figure 59 is a fragmentary elevation showing the interlocked clutchteeth.

Figure is a face view of the clutch member, showing the clutch teeth.

liigui'e 6l 1s a developed view of the teeth n of the clutch member.

' counterweight, and related parts.

.Sil

kparallel yrails 5, 6.

ladapted for use on an engine lathe.

Figure is a face view of the sheave and stop lug thereon.

Figure 66 isa fragmentary cross section through the control box, showingthe relations of the pause shaft and cam member, to the drive andtraverse trip shafts.

Referring to the drawings, lindicates the base of the machine which hasthe form of a pan providing supports 2 to which are bolted the legs ofthe bed 'the pan also providing an oil reservoir, having a pump 4arranged therein, and attached thereto, for forcing the oil upwardly tothe machine.y The bed 3, the detailed structure o't' which is vmorefully described in the co-pending application,y Serial No. 621,215,tiled lieb#` ruary 26, 1923, provides a pair of coplanar, n Upon therails are mounted a head-stock 7 and tail-stock 8, the tail-stock beingof any commercial type Each y of the rails of the hed is machined tokproyon from relatively opposite sides, the ca..

vide for gibhed engagement of the tool carriages, said tool carriagesherein being des ignated front and rear, respectively 9, l0.

rThe rails each independently support and guide a tool carriage havinga.tool-slide and tool thereon; whereby the work may be simultaneously andselectively7 operated upriage and tool-slide construction herein being aduplicate of that described in the 'above mentioned co-pendingapplication.

- The carriages and tool-slide units are of `duplicate construction andeach is gibbed to its respective rail. .The description of carriage andslide construction will therefor .ierein'be confined to that offenecarriage.r f The front carriage 9 on the rail 5 has its cutting toolsarranged to engage the work at the horizontal center thereof, pressureor strain yupon the carriage being in down` warddirection while thepressure or strain on the rear carriage l() Vis in an upward direction.The front carriage therefor has a rail engagement forsugporting itagainst downward pressures, andthe rearcarriage .a rail. engagement forsupporting it against 'upward pressares4v opposite sides of the L)`devices or F 15. in this iorin the stop on'the bearing surface 14:1. aprotection for the saine. vrihe gib-bloei; l5 rigid ports the rear endof the carriage against downward strains submitted thereto. upwardthrustof rear carriage strains carried by the gib-block l?.

inasmuch as the present invention pariciilarlv v sundirected to theautomatic control .e carriage and slide, only so much detion isnecessary for a clear-underi. of the carriage and slide .constructionand ction will be given herein.

Each carriage has its `feed screw shafts 26 respectrely front and rear.The screws are disposed longitudinally at the opposite side of themachine bed and each screw at the t -stoclr end is journaled in a bearin27, while at the liead-stoclrend each is coupled to screw drive shaftcontained in the control boi; 28, themannerot coupling being hereinaftermore fully described.

rilwo transmission controlling shafts 29, 30, herein called stop screwshafts, are employed, one for each carii'iage,`and the saine extendparallel with respective screw shafts and beneath the saine. Each shaftis longituninall;v slidably jonrnaled at one encf in the bearing 27, andat the opposite ends-re coupled to shafts which are mounted within thecontrol box. The stop screw shafts are both threaded for their lengthbetween their bearing points, and each shaft carries two i 'rs of nuts3l, ie a jainb nut. engage ie with respective opposite side. of thetraveler block for operating the con rol boiav mechaiiisin, to stopand'. reverse slide and carriage action.. The distance between the nutsgoverns the pof carriage and toolsiide traverse upon the rail in eitherforward or return directions, the nuts trip dogs being engagedv'ath thetraveler bloeit. One nut 32 is engaged when the carriage moves in a forTard direction toward the head-stock, and one of tie. nuts, 8l, engagedduring returnk carriage traverse toward the tail-stock. f

Modified forni' of stop JCM.

in Figure 50, in `which adjustment may beV quickly made; compare withycorresponding sleeveSla is retained, but the jainb nuts ofmodifiedstructure. @ne nut, 36, is ina-de in two half sectionsintsrioriytlireaded for engagementV with the threads of `the shaft 29anden/wieda tener-threaded@ llO vcast in the end Wall ot the apron.

nut 82, held against rotation in a hub or boss The boss at the outerside extends slip; itly beyond the surface or the wall to provide anannular surface having' thereon aV graduation marl; With which arerebistcrable. the graduations of the stop sew adjustingl collar S3splined to the longitudinal `groove 8l ot the stop screw, whereby whenthe collar is rotated in either direction the stop screw Will be rotatedand translated in Correspondine` direction :fior a predetermined distanThe jarn nut holds the graduated sto screw collar in adjusted position.`lilhen the lett end of the sleeve 63 engages the inside end ot the stopscrew S the carriage `will be translated upon its bed toward theheadetocl; until traverse of the feed nut is stopped either bydiscontinuance' of screw sha'tt rotation or by re versing the rotation.VEhe distance ot travel ot the sleeve 63 between the plate 80 an d theinner end ol the stop screw S, tl'ierei'ior delines the degreeot sleevetraverse 'for transmitting motion to the tool-slide The swivel block lais bored concentriciirlly with the boss at 8T andicoiiiuterboreil to'ngovide a circumferential shoulder., as a seat for a ball bearing` 89.The top ci the swivel block has a dove-tailed cross groove 90 as aslide-Way with which. coacts the correspond it S 'ing slide projection91 ot' the tocldioldingr slide 92, a lgib-being interposed forfriction-V ally and slidably atremiiiiie` the tool-slide 92 upon theswivel block. The crossor toolholding slide. has the usual toolattaching ly ringe to propel the same.

groove or slot-s Qd in its upper tace and has inaddition a longitudinaldepression or cavity 95 in its low-er side.l within which is fittedandftastened by screws aV rack 96, The j rr rack 96 is transmit`r "lvconnected with the leed nut rack in the following manner:

spur rear 9T` meshing; with the lgear rack 96. is fined at the upper end'ot a journ nal or shaft 08 rotatively step )ed in respective upper andlovrer ball bearings 89, 99e Keyed upon the lower end ot the shaft 98 isa sleeve spur l0() which meshes with the teeth Se ot the sleeve `Thuswhen the sleeve is moved in the appropriate direr-,tion the cross-slidewill be correspondinglv ledupon the carriage tov-ward or a ray trom theWork.

The rtrzweler blcclir and sleeve are non-rotatively sustained Within thecarriage, and the sleeve is adapted to engage with the carrthe spacedrelan tion between the carriage and sleeve or propelling' member, issuch that he abutting; engagement ot the member with the carriage ateither oi? regulatable spaced opposing` points determine the period anddegree ot tool slide transmission. independently of the Working` cycles.

with the carriage can be lied toward and into the Work, and alternatelyin retracted direction, for depth cutting or end facing of the work. Foranother cycle 'the tool can be ted from a retracted or starting positiontoward Vand into the work to a delinite degree during which period thepropelling member transmits the tool slide only. After the tool has beented to the desired cutting depth, cooperation between the propellingmember and carriage takes place for feeding the tool longitudinally ofthe work, and under such conditions thc propelling` member is incapableof transmitting' motion tothe slide, which slide is thus held lockedagainst cutting strains. ritter the carriage has been traversed for therequired distance to the end of the out, the direction of traverse ofthe screw is automatically reversed, following' which the cutting` toolis moved to retracted positionA and the carriage returned toward thetail-stock end ot the machine., to initial position.

Further description oi the structure and operation oit the carriage andtool slide is thought unnecessary, inasmuch as reference may be had tothe co-pending application betore mentioned. f

err/nge (md tool .eZ/cle friction device.

is desirable under cert-ain conditions to prevent carriage movementduring a traction ot a turning cycle to-Wit. during that traction inwhich the tool is being' traversed to cuttingfposition. ln a lacingoperation it is desirable to prevent tool slide motion w1 lle thecarriage moves to that position'at u h the tool feed should begin. In.order to t'rictionally yieldably hold the carriage While tool traverseis taking place, and to preventtool slide movement While carriagermovement is taking place, the 'following described friction device isemployed., in conjunction with the friction plate 56 and finger lOlcarried respectively by the machine bed and traveller block 68.

Upon the carriage apron and disposed intermediate between thetransmission control rod and the guide strips is a toothed wheel 102rotatably mounted upon a stub shaft 103 projecting` outwardly from theapron, (see Fig. d6). rlhe toothed Wheel is trictionally yieldably heldagainst rotation friction discs 104i ot suitable material placed atrelatively opposite sides of the Wheel., one between the Wheel and theside of the apron and the other at the outer side of the Wheel` asshown` rthe dises and Wheel being` held trictionally together by aspring;` pressed sleeve 06 having atlange engaged with the outer disc.The outer end ci the sleeve is soclreted and a spring 107 housed there-Withiny which spring is compressively engaged by a Washer'and nut inthreaded enllO gagen'ient with said shaft. In this instance, the'wheelhas three teeth, which are suitably spaced apart, two of which,respectively 105, 108, are adapted for engagement with the catch plateand the other 109' for engagement with the notch 101IL of the finger101.

The uses Vand setting of the friction device will be hereinafter morefully described under the headings, Setting of the machine for a.'nrninol cycle and Setting of the machine for a facing cycle.

@ont/'0l construction and operation.

The cortrol box contains mechanism operable for obtaining appropriatefeed screw movementsy to cause, in conjunction with the mechanism of thecarriage, successive rapid traverse of the tool towards the work; toolslow feed towards the work; cutting feed of the tool to the end of thecut; friction feed to a positive stop; pause of the tool after the endof the cut is reached, to allow cut to run out; rapid traverse of thetool away from the work to full retracted position; and return ofcarriage to initial position.

For the machine shown two systems of transmission gearing are employedfor rotating the feed screw. One for obtaining high speed results forreversible quick traverse of the carriage and tool slide, and which maybe regarded as independent of the head stock gearing for rotating thespindle, and a second for slow speed results in transmitting connectionwith the head stock gearing through the lathe spindle.

The transmitting control for the feed screw is started manually, thehand lever control being such that the transmissions respectively forthe two feed screws at opposite sides of the lathe can be operatedeither independently or simultaneously, the manual starting control`operating a clutch for the high speed transmission and for use, asforward direction of rotation. After starting the transmission controlis automatic, for obtaining a particular traverse cycle for the cuttingtool, as to advance the tool from .a starting position rapidly towardthe work, thence under a slower or cutting feed in to the work, fordepth cutting or facing and for turning after the tool has been slowlyfed into the work a. definite turning depth feed the tool at a cuttingspeed longitudinally of the work for the required and full turninglength, and thereupon on any retreating action, retreat quickly from thework and return to a starting position.

rlhe hand lever for starting control operates the trip rod or shaft 29which subsequently is operated by the feed nut or propelling member uponthe feed screw for translating the carriage and tool slide Manuallyshifting` the trip rod or shaft 29 in an appropriate direction4 operatesa fast feed clutch for throwing in the high speed transmission intoconnection with the feed screw for forward direction of drive. Afterstarting, the control is automatic, power operated clutch controllingmechanism operating for throwing out the fast feed clutch and throwingin the slow feed clutch. The slow feed continues until the A carriage ortool has moved or translated the required amount to operate the trip rodor shaft., whereuponthe slow speed clutch is thrown out but with theslow feed continuing through a friction drve intermediate of the slowspeed transmission and screw feed shaft operated by the trip rod orshaft in' its movement for throwing ont the slow speed clutch. Thispermits the feed shaft to be revolved until the cut completely runs out.The friction drive operates a cam which actuates the power operatedclutch controlling mechanism for completingl the power clutch controland release the control of the fast feed clutch for automatic operationand movement of the fast feed clutch for fast feed reverse to retreatthe tool and carriage to its starting position whereupon the trip rod orshaft is again operated by the moving carriage or tool slide propellingmember for throwing the fast feed clutch to its neutral position.

The transmission and controlling mecha-- nism for the feed screw shaftis compact .V

rganized and enclosed within a transmission casino` or box mounted uponthe lathe bed at the head stock end.

Within the box (see Figs. 5 and 6), disposed longitudinally thereof, allin parallel relation, are mounted five shafts; a drive shaft 110 coupledto the feed screw; a pulse friction shaft 111 intermittently rotatableby said drive shaft through suitable inschanism; a clutch shaft 112colinear with the pause friction shaft, upon which are slidably mountedthe traverse clutch and feed clutch forks; a traverse trip shaft 113shiftable by suitable mechanism for throwing out feed and forwardtraverse clutches; and a shifter shaft 11-1- as an extension of the stopscrew shaft 29, coupled with said shaft and operable therebyto actuatetraverse and feed clutch forks respectively 116, 11T, which forks inturn control the actuation of the forward and reverse traverse, and feedclutches respectively118, 119. rEhe drive shaft 110 is held at one endin a bearing at one side of the box and is counterturned and machined toprovide an enlarged head end 120, having a socket 121 therein into whichis adapted to be fit an extension 122 of the coupler shaft 123, whichshaft is rotatively stepped in bearings in the side wall of the box, itsouter projecting end being coupled with the feed shaft in a mannerhereinafter described.

Upon the enlarged head 20 of the drive v site shaft is keyed a sleeve125 carrying cireumferentially thereof a worm 126, and a spur gear 12T.The feed worm gear 129 has an extension sleeve 128 which is rotativelyliournalled in the bearing 130, midway of the bor, and rotativelyengages the counterturned portion 131 of the drive shaft. Th sleeve isthus rotatable upon the drive shaft and forms a support or bearing forsaid shaft. Set within a socket 132 in the side of the feed worm gear isa feed'clutch ring 133 having clutch teeth thereon, said ring beingnon-rotatively attached to the worm gear by screws. lWithin this ring isdisposed a iianged bushing 134g, the flange being engaged againstdisplacement between vide a shoulder1 138 against which are engagedthrust washers, and upon the counterturned portion and against thewashers is ro tatively `placed a bushed forward traverse miter gear 139.The shaft is further provided with an opposingly related reversetraverse hushed miter gear rotatabie upon a third counterturned portionof the shaft, and this portion is rotatably mounted within the bushedbearing 141. A drive miter gear 148 is in mesh with bot-h gears 139,140, said gear being attached to a shaft 149 mounted cross-wise of thebox, and ei:- tending therebeyond at the back, and coupled with thepower traverse gearing in a manner hereinafter described. The end of thedrive shaft 110 is threaded, a nut is pinned thereto at the outer side,and abuts the casing, to

prerent end play. rlhe shaft between the two gears is longitudinallyribbed as at 142 and engaged with the ribs 142 is the traverse. clutchsleeve 118'having teeth at its oppoends capable of engagement with thecorresponding teeth of the initer gears 139, 140. rEhe sleeve is groovedand said groove is engaged by the yoke 145 of the traverse clutch fork11b` which has spaced projections 145, 147, alternately engageable bythe finger 147a of the` starter shifter fork 148a mounted upon theshifter shaft 114, and held from rotation there on by a pin 148bprojected into a slot 148c of said fork. The shaft 110 is in axialalignment with the feed screw shaft 29 with which' it connects and maybe referred to as an extension of said screw shaft. The worm gear 129when connected with the shaft 110 throughthe clutch 119 constitutes theslow speed drive for the feed screw shaft receiving its motion from thehead stock gearing of the lathe through the spindle and the bev-- elgears 139 and 140 the reversible high speed drive for the feed screwshaft receivmotion from the main drive of the head stock independent ofthe lathe spindle. The worm gear 129 can also be transmittinglyconnected to the shaft 110 and feed screw shaft through an intermediatefriction transmission connecting worm gear 129 and spur gear 127 keyedon shaft 110 independent of the clutch 119, the friction transmissionbeing utilized for continuing the screw feed shaft rotation after theclutch 119 has been thrown out to allow the tool to be fed to the fullyend of cut, and operate a power clutch control. after the carriage ortool have been brought to the positive stop limits of the feedingtraverse, enabling the work to be turned' to approximately micrometerpre` cision, under automatic control. This may necessitate a slightpause in the tool or car- 3" traversing cycle to effect a change oftiansn'iission, the friction drive yielding to any position resistingrotation of the screw shaft due to any dead stop limits encountered inthe traverse of the carriage or tool, to avc-id injury" to the partsalthough permitting rotation to a clutch controlling cam. Therefore theintermediate friction transmission is herein designated as pausemechanism. i

Pause mechanism.

l Upon a counterturned portion of the feed worm gear sleeve extension128, is keyed a sleeve spur gear 150 having the same pitch as the spurgear 12,7, upon the cam worin sleeve 125. The two gears 127, 15() are inmesh with toothed friction disks 155, said disks rctatively mounted uponlateral tubuM lar extensions 156 of friction rings 157. The gear 150 isin mesh with four of the friction disks 155, while the teeth of the gear127 are in mesh with one-half the number, or in this instance, two suolidisks, designated The two disks act to drive the screw after the feedclutch is disengaged until the tool reaches the end of the cut, and thedead stop 290 is in contact with the control box. interposed between thedisks 155, 155% and the rings 15'?, is friction material 158, the amebeing attached in a suitable manner at each side of each friction disk.rllhe friction disks have translative non-rotative connection with thelongitudinal ribs 16() of the pause friction shaft 111, the said shaftbeing journalled at one end in a thrust bearing 161, against whichbearing the last friction ring of the series abuts. Against the lastfriction disk 1553, at the opposite endy of the series of disks androtatable with the pause shaft, is mounted a pause cam member 165,translatable upon the ribbed portion of the shaft and adapted to beforced against said disks, said member having the cam projection The cammember is socketed as at 166 at the outer side, and the pause shaftcounterturned to form a shoulder 167 lying within the socketcd portion.A compression spring 168 encircles the counterturned portion and abuts avasher, which in turn abuts the socket wall of the cam member, when thespring is compressed, and the shoulder 167, when the clutch isdisengaged and the spring selfcontained. The opposite end of the Compression .spring 168 is engaged by a compression sleeve 169 slidablymounted upon the counterturned portion, said sleeve having a flange 169aat its inner end within an opening of the control box wall. Rotativelymounted within the same opening, and concentrically engaged with androtatable upon the sleeve 169, is the pause adjusting sleeve 170 havinga projection 171 at its outer face, said face being further providedwith bevel gear teeth 172 engageable with the corresponding teeth 173 ofthe pause index shaft 174, which is horizontally disposed in a bearing175 at the side of the box, A. pause index disc 176 is attached to theoute' free end of the shaft 174C, is keyed to the shaft, and has notches177 in its periphery engageable by the circular end of a set screw 178having screw threaded engagement with the bearing 175.

Abutting the end of the compression sleeve 169 and mounted upon a secondand outer counterturned portion 180 of the pause friction shaft, issplined the pause cat-ch collar 181 having a tooth 182 engageable withthe projection 171 of the pause adjusting sleeve 170 as a result ofwhich, when the pause adjusting sleeve is turned in a clockwisedirection (see Fig. 12) the pause catch will be correspondingly turnedand with it the pause friction shaft and pause trip cam: therebyadjusting the angular relation of the cam 165Z1 with respect to thepause trip block projection 185 of the block 184s, against the torsionalaction of the coil spring 186 attached at one end to the pause camsleeve as at 187 and at the opposite end with the frame as at 188. Thepause cam is returnedto its previously set initial position, whencompression upon the spring is removed, by the torsional action of thecoil spring 186, the pause adjusting sleeve being turned againsttheaction of said spring. One member of a thrust bearing 189 is engagedagainst a shoulder of the pause catch 181, and the opposite element ofthe bearing 1s held within a sleeve 190 rotatively and slidably mountedupon the counterturned outer end of the pause shaft. This sleeve has areduced hub extension, and a shoulder 191 is formed at the outer side.At the extreme end, the pause shaft is again counterturned and threaded,and a nut having threaded engagement therewith, is pinnedthereto in aposition to allow slight outward play between the outer end of thesleeve 190. and nut, a play sufficient to permit relief of pressure uponthe spring 168. Between the nut and sleeve extension at dian'ietricallyopposite sides, are disposed shoes 198 projecting inwardly from thetwo-part pause lever 194i-, which lever is pivoted at one end as at 195to the bearing or bracket 17 5, and has at its opposite extremity,inwardly projected shoes 196 adapted for engagement with one face 197 ofthe stop shaft coupling 198, and with the opposingly related face of anut 199, in threaded engagement with and pinned to the stop screw shaft29. Vhen said shaft is thrown to the left, pressure is exerted upon thepause shaft sleeve by shoes 193, and thrust transmitted to sleeve,spring, and pause trip cam, to compress the friction disks and, duringmachine operation, to cause rotation of said cam.

The friction disks are under compression before the feed clutch is fullydisengaged. rnnediately upon the complete withdrawal of the feed clutch,but before the tool reaches the end of the cut, the two friction disks155, through their connection with the sleeve, will cause continuedrotation of the feed .screw until the face 200 of the coupling 198engages the side of the box; positively preventing any further movementand definitely determining the end of the cut. ilfhen the end of the cuthas been reached, the disks 155a will slip or idle, and the four disks155 will rotate the pause shaft 111 and pause cam member 165, tosubsequently engage the reverse traverse clutch when the cut has beenrun out. As soon as the friction disks are sufficiently compressed toovercome any non-rotative resistance upon the shaft 111 the shaft willbe rotated, rotating the cam member 165, to bring its cam 165a intoengagement with the" pin 185 of the slow feed clutch shifting element184i for actuating the clutch controlling member 117. As the cam movesthe clutch controlling mechanism a distance beyond that requireddisconnecting the clutch 119 with the worm gear 129 for tripping thehigh speed clutch mechanism, and the cam moving coniparatively slow, thefriction drive is capable of transmitting motion to the feed screw withthe gear 129 disconnected from the clutch 119 until a dead stop isreached. The pause shaft rotating less than a complete rotation andtimed for the degree of revolution required to bring the cam 165a from astarting position into operative engagement with the pin 185 of theclutch shifting element 184i. It being recognized that after the cam hasfunctioned for a transmission control the reverse high speedtransmission is thrown in rotating the feed screw shaft in a reversedirection for retreat or return traverse of the carriage and tool slide.rThis being counter to the direction of the slow feed drive transmittedby the worin O'ear 129 a sli onine' of the friction y between the forksfor forcing the same awa-y from one another in opposite directions.

fllliedegree of separation is limited by the yrelatively -opposinglyfaced semi-circiilar abiitments 9.02, 203. Then either forli is movedtoward the other the snrin is coml an press-ed, vconditioning thatother, for operating its clutch upon the actuation orrelease yof theproper mechanism. The traverse jclutch fork 116, before stated, has theeX- tension 145 enga-ged within a circumferential groove' of theltraverse clntch 118, which clutch hasfteetlrat relatively oppositeends,

o res iectivel for engagement with the correspending teeth of theforward traverse miter gear and with the reverse traverse miter gear140.

Hold-out for feed clutch.

yworincliitch ring, (see Figs. 6, 39 and 40), is provided vin itsperiphery with the elongated notch 135 extending inwardly from theclntchqside, said notch having a pocket 135@ at one extremit merOinGinto an oiitwardly slanting cam face 135, which face extends totheopposite side of the notch,

the 'end walls of the notch forming the abutmentsc, 1351. VHeld in thefeed clutch in horizontal position is the pin 136 having its endextending beyond and projected withinthe notch and adapted to' engagethe socket portion thereof when the feed clutch isfengaged. The clutch119 can not vbe .shifted into engagement with the worm gear129 when theclutch 118 connects with either of the high speed gears 13) or 14:0 asthe rotation ofthe shaft. 110 would be rsuch. asvto establish andmaintain `the friction ring 134m a position so that the pin 136 yin thelnotch in the ring would hold the clutch 119 out.r The rotation of theshaft 110 must be reduced or stopped to permit the ring to be iniduencedby vthe rotation of the' gear y129 to advance the notch .so that thepin`136 lcan kbe engaged in the pocket 135, clutch is in` 'andthe feedclutch has been disengaged,said clutch will be positivelyheld ont ofengagement with. thev teeth of the feed "worm gearcliitch ring, for therreasonthat TiWhen, however, the forward traverse when the formirdtraverse clutch engages,

the rotative speed of Jfhedrive shaft, and feed clutch keyed thereto, isincreased over that of the feed worm rotation, and the pin is held inengagement with the forward abutment 135d and rests upon the inclinedface 135, thus holding the clutch in iinclutched position. The cam ring,being frictionally rotatively mounted, will rotate with the disengagedfeed clutch when the pin 13G is engaged with the forward abutment orshoulder 1351.

Feed and traverse latch mechanism.

rIhe traverse clutch fork is forcibly but yieldably locked in forwardtraverse clutch and feed positions by latch mechanism, in the followingmanner: (see 5, 7, and 8). A lever 21() is pivoted centrally of itslength to the frame as a i 211. Each arm of the lever has a pinprojecting inwardly therefrom, f each pin spaced an equal distance fromthe pivotal point of the lever. The upper pin 212 is, -ander certainconditio-ns, engageable with the inner face 218 of the fiange ofthesleeve 214 rigidlyiattached to the traverse trip shaft, and acting asa bearing, slidable in the box wall. The lower pin 218 has a blockprovided thereon, which block is slidably 'engaged between the spacedkprojections 219 of the traverse clutch fork 116. The lower end of thelever 210 is provided with two notches, respectively herein designatedas forward traverse notch i220 and feedfnotch 221, eaclr alternatelyengageable with a spring pressed pawl 222, pivoted as at 223 to the boxwall. When the feed notch 221 is in engagement with the pawl, the spring201 is compressed and the feed clutch is engaged. n traverse notch isengno'edwith the pawl, the ytraverse clutch engaged with the forwardtraverse miter gear 139. lWhen the shifter shaft 114 is moved. to theright at the cominencement of a cycle, the finger 14]?" of the startershifter fork 148"L 'engages the projeen tion 147 of the clutch fork 116,moving it to the Aright iintl the traverse clutch is engaged withr theforward traverse miter gear. y block on the pin 218, being slidahlyretained between the projections 219, is carried to the right,alsomoving iever 210, so that at the 'time the clutch is engaged theforward. traverse notch is in engagement kwith the pawl. The upper kpinmeanwhile has engaged the inner face 218 of the flange of the sleeve21e,attached to thetraverse trip shaft 113, moving it rto the left andwith it, by abutting engagement ,with r the nut 26:5, sleeve 264,yOlre'QGQ, tripblool; 184C, feed trip block 270, sleeve 275, and finallyfeed clutch fork 117, thereby withdrawing the feed clutch, andconditioning pin 136 for engagement with theinclined face of cam ring134. By vthis ysame movement, traverse trip TheA

